Electrical switching between exciton dissociation to exciton funneling in MoSe<sub>2</sub>/WS<sub>2</sub> heterostructure.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 32457328.
- Also identified by DOI 10.1038/s41467-020-16419-x and PMC identifier 7250925.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
The heterostructure of monolayer transition metal dichalcogenides (TMDCs) provides a unique platform to manipulate exciton dynamics. The ultrafast carrier transfer across the van der Waals interface of the TMDC hetero-bilayer can efficiently separate electrons and holes in the intralayer excitons with a type II alignment, but it will funnel excitons into one layer with a type I alignment. In this work, we demonstrate the reversible switch from exciton dissociation to exciton funneling in a MoSe<sub>2</sub>/WS<sub>2</sub> heterostructure, which manifests itself as the photoluminescence (PL) quenching to PL enhancement transition. This transition was realized through effectively controlling the quantum capacitance of both MoSe<sub>2</sub> and WS<sub>2</sub> layers with gating. PL excitation spectroscopy study unveils that PL enhancement arises from the blockage of the optically excited electron transfer from MoSe<sub>2</sub> to WS<sub>2</sub>. Our work demonstrates electrical control of photoexcited carrier transfer across the van der Waals interface, the understanding of which promises applications in quantum optoelectronics.